ON THE EXTINCT ANIMALS OF NOKTH AMEEICA. 
289 
by two nearly equal facets to the magnum and unciform, and 
the astragalus articulates largely with the cuboid, which it does 
not in the elephants. The presence, however, of five complete 
and distinct toes to the fore foot, and probably also to the hind 
foot, is a definite distinguishing character from any known 
Perissodactyle. 
The vertebrse, in their main characters, resemble those of the 
Proboscideans ; though the neck was somewhat longer in pro- 
portion. The tail was long and slender. 
The head was long and narrow, and in its essential features 
more resembling that of the rhinoceros than the elephant. It 
Fig. 2. 
Eestored skull of Uintatherium ( Dinoceras , Marsh). 
! was elevated behind into a great occipital crest, as in the former* 
but, unlike that of any other unknown animal, it had developed 
from its upper surface three pairs of conspicuous laterally di- 
verging protuberances, one pair (the largest) from the parietal 
region, one on the maxillaries in front of the orbit, and one 
much smaller than the others, near the fore part of the elon- 
gated nasal bones. Whether these were merely covered by 
bosses of callous skin, as the rounded form and ruggedness of 
their extremities would seem to indicate, or whether they 
formed the basis of attachment for horns of still greater extent, 
either like those of the rhinoceros or the buffalo, must still be 
a matter of conjecture. Whichever may have been the case* 
they would have given a very strange aspect to the creature 
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